Means for forming hinge-pin holes



(No Model.)

N. BURDIUK & J. ABANDFORD.

I MEANS FOR FORMING HINGE PIN HOLES.

No. 317,498., Patented May L2, 1885.

W a? d f [mi/L115? I 0%JJM UNITED STATES PATENT OFFICE.

NORMAN BURDIGK AND JAMES A. SANDFORD, OF ALBANY, NEW YORK.

MEANS FOR FORMING HINGE-PIN HOLES.

SPECIFICATION forming part of Letters Patent No 317,498, dated May 12, 1885.

Application filed January 23, 1865.

.To all whom, it may concern:

Be it known that we, NORMAN BURmcK and JAMES A. SANDFORD, citizens of the United States, residing at Albany, in the county of Albany and State of New York, have jointly invented a new and Improved Means for Forming Hinge-Pin Holes in Cast-Metal Plates, of which the following is a specification.

Our invention relates to a new and improved means for forming pin-holes in 11in ge-knuckles of cast-metal plates, (intended to be hinged together,) whereby the plates produced will be made to have their respective coacting hingeknuckles properly provided with accurately formed and placed holes for receiving hingepins without the labor and expense of drilling, and in such a manner that any one of a number of duplicate door-plates having their hinge-knuckles provide'd'with these pin-holeswill properly'and perfectly fit with any one of a number of duplicate door-frame plates provided with coacting hinge-knuckles having similarly-formed pin-holes and our invention consists in the means hereinafter described and specifically set forth in the claims.

The object of our invention is to produce,

Q without the labor and expense of drilling, in

knuckles of hinges of cast-metalplatessuch as stove-door plates and stove-door frame plates-pinholes which shall be uniform in size and have such absolute accuracy of position and place in the respective coacting hingeknuckles that any one of a number of duplicate cast door-plates will perfectly fit and hinge with any one of a number of duplicate cast door-frame plates by the same pin or pins.

We attain these objects by the means illustrated in the accompanying drawings, forming a part of this specification, in which- Figure 1 represents a plan view of the pattern embodying one part of our invention. Fig. 2 is a cross-sectional view of the same with the hole-shell and its hood in place. Fig. 3 is a perspective view of the metallic holeshell employed by us. Fig. 4 is a sectional elevation of the same. Fig. 5 is a cross-sectional view. Fig. 6 is a perspective view of the hood employed with the hole-shell. Fig.

7 is a sectional elevation of hole-shell and hood in position. Fig. Sis a cross-sectional view of,

(No model.)

the same. Fig. 9 is a sectional view of the pattern with shell hole and hood in placeinamold. Fig. 10 is a sectional view of the mold with pattern withdrawn and hole-shell and hood in position in the mold preparatory to casting. Fig. 11 is a sectional elevation of the same. Fig. 12 is a perspective view of a cast plate provided with a hole produced by the practice of our invention. Fig. 13 illustrates perspec- 6o tive view of a hole-shell and hood made in one piece. Fig. 14 represents a sectional view of the same in position in the pattern. Fig. 15

is a perspective view of a modification of the form of the hood which may be employed. Fig.'16 is a sectional view of a modification of the tubular shell, and Fig. 17 is a sectional elevation of this modified form of hood and tubular shell.

The same letters of reference refer to simi-' lar parts throughout the several views.

In the drawings, A represents a pattern-- such as a stove door plate or astove-doorframe plate -having hinge-knuckles A A, which are to be molded for producing castmetal platesin which the knuckles will be perforated when cast for reception of the hinge pin.

B is a thin sheet metal hole-shell or tubular cylinder having its bore a of the same diameter as that of the pin to be employed with the hinge.

U is a hood (also made of sheet-metal) which is applied to tubular cylinder B either before the latter is seated in the pattern or after it has been seated, as may be preferred. The knuckles A of the hinge portions of the pattern are each provided with a gradually-tapering recess, D, which extends from end to end of said knuckle, or to the full distance the pin-hole is to be produced in the plate when cast. The bottom of this recess is made concave and with a curvature correspondingwith the curvature of the outer circumference of tubular cylinder B, which said recess is to receive when molded. The upper flaring end of this recess D is made with an extension corresponding with the cross-extension of hood 0. The hood 0 may be attached, before used in the pattern, to tubular cylinder B by solder, or be in a single piece (or otherwise) with its side flanges, e, setting against the margin ends of the cylinder, as shown in Figs. 7,8, and 13. This may be done, if preferred, for convenience in settingthepieceB in place, though it is not necessary in the practice of our invention. Pattern A is to be molded from its nowel or drag part of the flask in the usual 2. The sand will be riddled on the pattern and the molding will be proceeded with in the usual manner practiced by the trade. In the molding the sand will fill around the knuckle, but the chamber D, bounded by the sides 8 of recess 1), lower side, 8, of the hood, and side 8 of the tubular shell B will remain unfilled, as shown in Fig. 9. The flasks are then together inverted and brought from position shown in Fig. 9 to that shown in Fig. 10, with drag side (1 of the mold down and cope side d uppermost, when the cope will be lifted and pattern A drawn from the drag, leaving the hooded tubular cylinder B remaining in the mold in aninverted position, so that when the two parts of the mold are joined for casting the said hooded tubular cylinder will be in its true and intended position in mold M, in which the tubular cylinder will be supported in the mold M by the hood 0 resting on the bottom of the mold, as shown in Fig. 10. In the mold the tubular cylinder B will have its open ends bearing against the opposite sides of the mold, with the cavity of the same free and clear around the entire portion of said cylinder B. The molten metal will then be poured into the mold in the usual manner, and will flow around the tubular cylinder, and when cool will hold tightly with the same and produce cast plate I? in Fig. 12 with a perfectly-formed hole or bore, a, in exact situation in the plate, as designed, and as represented in that figure.

In Fig. 13 is shown a sheet-metal hole-shell, B, and supporting-hood 0, made from a single piece of metal. In Figs. 15 and 17 is shown a hood, 0, which has its end portions, 6, extended down past the ends of tube B, and provided with inwardly-projected depressions a which engage with the flare a of the ends of tube B, and thereby hold with the same to retain it in proper position without the employment of solder when said tube and its attached hood. are in place in the pattern, and. also when in the cope when the pattern has their respective duplicate hoods G, are set into without in the least disturbing either of the patterns or effecting a relative moving of the respective hoods (3, held in place by the respective recesses D of the neighboring hinge knuckles. The patterns, being thus properly fitted with recesses D, when molded will properly hold the hoods O and their respective pinhole shells B in position while the patterns are being molded, and will leave them accurately adjusted and placed within their respective molds when withdrawn, so that the respective coacting cast plates produced from these molds will accurately fit each other with the pin-holes of the coactin g knuckles lining with each other and adapted to readily receive the same hinge-pin.

By our above-described improved means for forming holes in cast plates we are enabled to duplicate each plate cast from the pattern With the holein each plate in exact corresponding positions as in the others, while at the same time the holes in one plate will be of exact corresponding and uniform diameter as those in the others, and we are enabled to dispense with the use of power, machinery, drills, and time and labor in drilling heretofore required, and we are also enabled to produce two different cast plates having each a coacting knuckle of door or other hinge, which will have formed in each, when cast, an accuratelylocated hole which will correspond with that in the other in position, diameter, and form, and thereby be enabled to make from the same two patterns of two plates provided each with corresponding coacting knuckles, duplicate castings with any number of each, which will be so accurately perforated as to enable any one of the cast plates of one class to be accurately hinged by its knuckle to the knuckle of any one of the cast plates of the other class, and thereby we are enabled to produce for stoves and other articles of cast metal cast door-plates with their hinge-knuckles accurately perforated for receiving the hinge-pin, and cast side plates (receiving the door-plate) provided with hinge-knuckles, also accurately perforated to receive the same hinge-pin, with the door-plate held closely fitting in all its portions to the plate it is hinged with, so that any one of a number of duplicates of the doorplates will accurately hinge with and fit with any one of the other plates also duplicated, which is of great advantage to stove manufacturers and dealers when called upon to provide a door in place of one broken in a stove.

Having described our invention, what we claim, and desire to secure by Letters Patent, 1s

1. The sheet-metal pin-hole shell B, having attached thereto hood 0, whereby said shell will be accurately adjusted within a recess made in a hinge-knuckle pattern, with a correspondence of form with that of the said. hole shell B, provided with hood 0, substanhood, and be supported within the mold when tially as and for the purposes set forth.

the pattern is withdrawn from the same, NORMAN BURDIGK. substantially as and for the purposes set JAMES A. SANDFOBD. 5 forth. Witnesses:

2. The combination, with recess D, made in ALEX. SELKIRK, Jr.

a hinge-knuckle pattern, of sheet-metal pin- ALEX. SELKIRK. 

